Brush-holder for motors or generators.



PAT'EYNTE'D' PEBL'Z'], 1'906.

I F. L. SESSIONS. BRUSH HOLDER FOR MOTORS 0R GENERATOR:-

APPLIOATION FILED KAY 20. i903.

" iflinesses- UNITED v STATES PATENT OFFICE.

FRANK L. SESSIONS, OF COLUMBUS, OHIO, ASSIG-NOR IO JOSEPH A. JEFFREY, OFCOLUMBUS, OHIO.

Specification of Letters Patent.

Patented Feb. 27,1906.

Application filed May 20,1903. Serial No. 157,980.

To all whom it may concern:

Be it known that I, FRANK L. SESSIONS, a citizen of the United States,residing at C0- lumbus, in the county of Franklin and State 'ofOhio,-have invented certain new and useful Improvements in Brush-Holdersfor Motors or Generators, of which the following is a specification,reference being had therein to the accompanying drawings.

This invention relates to improvements in the devices for holding andfeeding the car bon brushesv of the sort commonly used in connectionwith the commutators of electric motors and dynamos.

The object: of the invention is to provide a nwcl'iai'iism which will beof the simplest possible form and with its parts compactly arranged andforming a unitary structure which can be readily put in place inrestricted. s )aces, such as the commutator-chamber in the inclosed orbox-like motors.

Figure 1 is a side elevation of abox-motor with a portion broken away,showing a bru sh holdermechanism sufficient to illustrate the manner ofapplying my im rovements. Fig. 2 is a side view of a rushholdcr. Fig. 3is a front view. Fig. 4 shows one of the clamping-pieces of the brushdetached and in topplan, side elevation, and rear elevation. 'Fig. 5illustrates detached the outer part of the follower that advances thebrush, showing it in rear elevation, side elevation, and end view. Fig.6is a detail v'imvof the insulating contact-piece carried by thefollower. Fig. 7 is an'enlar ged sectional view of a portion oftheinsulating supportingblock for the brush-holder. Fig. '8 is a faceview of the plate employed in securing the insulating-block in place. Fi9 illus trates the bedplate H detached, 3 owing it in side elevation,end view, and top plan. Fig. 10 is a plan view of the base-plate thatrests upon the bed-plate, the legs that rise from the base-plate beingin section. Fig." 11 is a to plan view of the contact-plate P.

In the drawings I have illustrated more or less of a box-motor-that isto say, a motor of the class in whichthe armature and commutator areinclosed in two field-sections.

field-sections at B, and the other at B. The armature-shaft a is mountedin bearingsC C. The bearing C extends inward somewhat, as shown at c,from the wall I) at the end of the motor.

1) indicates the commutator, which is positioned between the end of thearmature and the bearing C.

E is a comparatively large block of insulating material, preferablywood. It is formed with a recess or countersink E upon its inner side.In this there is fitted a metallic plate F.

G represents the fastening-bolts which extend through apertures ate inthe block and engage with the metallic nut-plate F, these Earts servingto firmly bind the insulatingase to the inner side of the wall I) of themo tor. After the metallic plate F has been inserted into the recess Ethe recess may be filled up or closed by means of insulating material,as indicated at E so that all of the surfaces of the insulating-blockwithin the motor-casing will be of insulating material.

H is a bed late secured to the insulating- 7 block E. It 1s formed withguide-ribs h and stops at h. The part that sustains the brushhas abottom plate I, which is fitted in the guide-plate h, this plate Ihaving a slot at '6, through which passes the clamping-bolt J, thelatter serving to fasten the plate I in the desired position ofadjustment.

The brush is indicated by K. It is held in the box L, supported uponlegs M, integral with and rising from the base-plate I. The brush is atits rear or outer end connected to the flexible conductor N, the ends ofthe latter being respectivelysecured in clampingpieces 0 0, each ofthese having a clampingplate, as shown at 0, and a side plate, as

shown ate, with an'aperture for the end of the conductor N. This clampis formed in two parts in order to provide for the insertion of thebrush within it and the efiiciency of the clamping action when the twoparts are drawn together upon the brush. This drawing of the two partstogether and clamping of the brush between them is accomplished by meansof a bolt 0 which extends upward through the plate 0 at the lower sideof the 50 i The armature is shown at A, one of the 1 brush K and throughthe brush, and is screwed into the threaded aperture in the plate 0 ofthe upper part of the clamp. It will be seen that the clamping of thebrush between the plates is obtained by adjusting the bolt 0 This lattermay be quickly removed when it is desired to remove the brush. Theconductor X is secured to a con tact-plate P, slotted at 'p. The latteris rig idly fastened to the binding-lug Q, which is situated above thecarbon and is preferably formed integral with the brush box L.

R is a binding-screw passing through the slot y) in the plate, and R isa jam-nut adapted to clamp the plate P tightly against the lug Q. Thelug is providedwith an aperture (1, into which is fitted the end of thelead-wire S.

It will be seen that the conductor N connects both parts of the clampinto the electrical circuit from the brush, so as to insure a good andsuf'licient electrical connection between the brush-clamp and thebinding-post.

The carbon brush K is advanced through the box by means of a.spring-held follower T The latter is made in two parts t and i. The part.t is pivoted at U to the legshf, and .the two parts 1% t are pivotedtogether at V.

W is a'spring connected to the follower and to a stationary holderas,for instance, a pin or bar on the legs M-and tending to draw the outerend of the follower toward and against the forward end of the carbonbrush.

t is a handle on the lower part t of the follower and by means of it thefollower can be.

drawn back at anytime'ars, for instance, when it is desired to withdrawthe carbon and insert another or for other purpose.

The upper part 23 of the follower is free to move in one directionaround the pivot V, but by means of a shoulder or lug at t is stoppedagainst movement in the opposite direction beyond a predetermined limit.To the upper end of tlns part t" there is secured a piece ofinsulatingmaterial T as, for instance, a small piece of lava. The end ofthe follower-arm is preferably formed with a cav,

I ity, as shown at t, and the insulation has a cylindrical or othersuitable form to fit this cavity It can be fastened in place if it beprovided with notches or recesses, as at i, into which the metal at theends of the cavity t can be bent.

that I claim ise 1. The combination with the brush-hold er and thebrush, of the pivoted spring-held folbelow the brush-box and formed intwo parts, the outer part being connected to the inner by a pivot andhaving its outer end adapted to move around the said pivot in onedirection and locked against movement in the other direction whenbearing against the brush, substantially as set forth.

3. The combination with the brush-holder and the brush, of the pivotedspring-held follower formed in two parts, the lower part being securedby a statlonary pivot and having a handle, and the upper part beingsecured to the lower part by a pivot and locked against movement aroundsaidpivot when bearing against the brush, substantially as set forth.

4. The crnnbination with the brushholder,

the brush, the lead-\\-'ire-binding lug adjacent 7. The combination ofthe brush movable bodily toward the commutator, means for forcing thebrush toward the commutator, a

brush-holder formed of two parts, and a means for causing them both totightly clamp the brush, flexible conductors, one connected with each ofthe clamping parts of the brushholder, and acontact-plate to which boththe said conductors are connected, substantially as set forth.

8. In a box-motor, the combination with the armature, the commutatorand'the inclosing field-sections having the closed end walls sup portingthe armature-shaft, the bcaring for the shaft projecting inwardly fromthe closing wall, the insulator arranged to overlap the said bearing andsecured from-the exterior to the said closing wall, the bodilystationary brush-holder adjustably secured to the said insulator, andthe spring-held followeradapted to bear againstthe brush in the holder,substantially as set forth.

- '9. The combination with the brush-holder and thebrush, of thesuing-held follower bearing against the brush and having at its endadjacent to the brush a cavity in which is situated an insulator held inposition by the bent-in end walls-of said cavity.

10; Thecombination with the brushholder, the brush and the spring-heldfollower bearing against the brush, of the piece of in- I sulatingInaterial T hafing the notohesrf in I In testimony whereof I affix mysignature its ends, the upper end of the said follower in presence oftwo witnesses.

having a cavity t into which the said piece of Y insulating material isfitted and the end -Walls F K SESSIONS of which are bent into thenotches t of said Witnesses: piece. of insulating material to fasten itin LILLIAN BLACKMORE', place. E. F. ABRAM.

